> There was levofloxacin, which can cause Achilles tendon rupture
Levofloxacin is a fluoroquinolone antibiotic (a generic, also under the brand name Levaquin), along with ciprofloxacin, norfloxacin, and others. Fluoroquinolones can cause a large variety of permanent and disabling systems that doctors are not well trained to recognize. They don't just attack the achilles tendon, for example, they can cause tendon ruptures anywhere in the body, as well as retinal detachments. The Achilles is more likely to go first simply because it's a more used tendon with a higher load to tendon size ratio.
They also can cause a variety of permanent neurological conditions which doctors also aren't well trained to recognize. These drugs are well documented to potentially cause permanent damage to your nervous system, yet doctors don't know about the how or why of the damage, if they are even aware of the link. In my experience, most aren't, given that the link wasn't discovered until more than 30 years after the drugs were released.
They also cause mitochondrial impairment and die-off, along with mitochondrial DNA damage.
Given all of this, how many long term chronic sufferers might have side effects related to fluoroquinolones? Many people who are affected report neuropathy, brain fog, physical impairments, and sometimes psychosis. Given that fluoroquinolones are documented to attack almost any part of human body functioning, how do you accurately link long term chronic conditions to the use of these drugs? For fluoroquinolone damage, there aren't even tests to confirm links, only the lucky few will have doctors who put together the notes from taking medical history.